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unlocking the buttons, the notice “ ” appears in place of
the time characters for a couple of seconds, whereupon all the
buttons can be used normally again.
8. CHANGING THE BATTERY
The average lifetime of the batteries is 1 year, but frequent
use of the background light may shorten this time consider-
ably. If the icon indicating low battery voltage appears on
the display, the batteries should be replaced (see Chapter
2.1). The exact time should be set again after the batter-
ies have been replaced, but the device saves the program
and the settings that has been loaded even without batteries
therefore there is no need to reprogram the device.
Warning! Alkaline batteries may only be used for this ap-
pliance. Carbon-zinc batteries known as durable or long life
batteries and chargeable accumulators are not suitable for the
operation of this appliance. Icon appearing on the display to
indicate low battery voltage warns reliably that the batteries
should be replaced only when alkaline batteries are used.
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